Hi all,
A plumber has fitted (on his recommendation) the following set up:
Boiler: Vaillant ecoTEC Plus 2 620
Controls: Vaillant sensoCOMFORT VRC 720F (including weather compensation)
Wiring Centre: Vaillant VR66/2
Cylinder: Mixergy MX150 Indirect
All was in and well from a central heating perspective, but the plumber was not able to get the Mixergy call for heat to register a demand with the boiler. This should be configured with PDHW whenever a call is made from the Mixergy.
After many (so many…) hours on the phone to both Vaillant and Mixergy, we have the current suggestion from Mixergy on how to wire the cylinder using the cylinder stat terminal:
Mixergy indirect cable:
Black core to VR66 CYL number 2
Brown core to VR66 CYL number 1
Due to being volt free you shouldn’t need to connect the grey/earth connections, but I would recommend making the grey safe and linking the earth in with one of the other earth connections on the VR66 wiring centre just in case.
Hot water 2 port valve:
Earth cable to DHW ON Earth connection
Neutral cable to DHW ON Neutral connection
Brown cable to DHW ON Live connection
The Grey/white and orange cables left unconnected and made safe.
This was tried with the hot water schedule set to 24/7 (and boost as well), but has not worked. In addition, the boiler has now developed an F.105 error (gas valve alignment), for which we cannot find any info online or via the Vaillant service centre.
Does anyone have experience with this set up?
Thanks in advance,
Notagain!
A plumber has fitted (on his recommendation) the following set up:
Boiler: Vaillant ecoTEC Plus 2 620
Controls: Vaillant sensoCOMFORT VRC 720F (including weather compensation)
Wiring Centre: Vaillant VR66/2
Cylinder: Mixergy MX150 Indirect
All was in and well from a central heating perspective, but the plumber was not able to get the Mixergy call for heat to register a demand with the boiler. This should be configured with PDHW whenever a call is made from the Mixergy.
After many (so many…) hours on the phone to both Vaillant and Mixergy, we have the current suggestion from Mixergy on how to wire the cylinder using the cylinder stat terminal:
Mixergy indirect cable:
Black core to VR66 CYL number 2
Brown core to VR66 CYL number 1
Due to being volt free you shouldn’t need to connect the grey/earth connections, but I would recommend making the grey safe and linking the earth in with one of the other earth connections on the VR66 wiring centre just in case.
Hot water 2 port valve:
Earth cable to DHW ON Earth connection
Neutral cable to DHW ON Neutral connection
Brown cable to DHW ON Live connection
The Grey/white and orange cables left unconnected and made safe.
This was tried with the hot water schedule set to 24/7 (and boost as well), but has not worked. In addition, the boiler has now developed an F.105 error (gas valve alignment), for which we cannot find any info online or via the Vaillant service centre.
Does anyone have experience with this set up?
Thanks in advance,
Notagain!